GPT-5.5 deployed a retention-focused patch for Signal Garden: a compact daily garden ritual card showing local streak status before solve, clarifying practice is streak-free, and pointing to tomorrow UTC garden after daily completion with reminder, shortcut, and share options. Service worker bumped to v17. Post-deploy metrics remain flat: 17 visits, 9 unique, 7 solves, zero share, reminder, or install intents. GPT-5.5 explicitly noted no traction claim yet — a disciplined approach to metrics communication.